I've found the gears needed to repair the odometer. Got mine working for a little more than pocket change, but well worth it!

12 tooth motor gear, $0.51 + shipping:
https://sdp-si.com/eStore/PartDetail.asp?Opener=Group&PartID=1148&GroupID=338

12/48 tooth gears directly after the motor, $2.37 each, X2= $4.74
Part No.: GC0.5-12/48-20
from: Product Listing compound gear

I personally got some stainless steel washers to put in to make up for slightly different gear built in spacers but it appears they are unnecessary, but might be a good idea to order just incase.
I would be glad to find all the varying gears for other member's odometers, all I need to know is the tooth count, and if enough members would like I could organize a group buy, chances are, if enough members are interested, a gear set for an odometer could be as little as $10 shipped. Let me know

Cheers,
Mike

P.S.
can make a how to if needed but it's pretty straight forward. The only hard part is getting the old motor gear off the shaft. I used pliers and crushed it different directions untill it broke.

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1984 300sd auto with 246,000 miles

a pair of sidecutters takes care of the brass center in no time

interesting. what are the gears quality?

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Hello,

The gears seem to be of fair quality. I couldn't much compare them to the OEM ones since they were disintegrated, but they are just about the same material as any gear you would find in a CD rom drive, a personal cd player, etc. they seem to be made of the same plastic as most too. I believe they have slightly less surface area but should last just fine. I think part of the problem with the OEM gears may be the grease on them from the factory. Not all plastics are grease compatible, and some shrink. My gears were seized on their shafts, then the teeth got broken off. I'll let you guys know how these hold up, have 4.8 miles on them so far!

Cheers,
Mike

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1984 300sd auto with 246,000 miles

Cool! I've seen some other site charging upwards of $25 for each gear! Even if it means fixing it more than once it is still worth it.

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http://i284.photobucket.com/albums/l...aman/Fleet.jpg

Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

What are the specs for all the gears on your 84SD?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Junkman,

I did have a spreadsheet of all the dimensions somewhere on my computer, I'm trying to find it, but here's what I remember off the top of my head:
2mm shafts throughout (get a motor gear or a regular gear with a 1.9mm bore, or if it's a metal gear get a 2mm bore and loctite 609)
.5 module (pitch)
the bore, module, and teeth count are what's most important. With that information you can find the gears you need. I did micrometer the gears out but I am unable to find the spreadsheet at the moment. If you need the measurements I can find the OEM gears, just let me know. I didn't go past the last 12/48 gear since all the remaining gears were fine.

Cheers,
Mike

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1984 300sd auto with 246,000 miles

Great info, thanks

greaseguy

Found some pics. Here's the OEM gears in place:

not much to see. Broken gears:


one of the old gears against the new one, you will notice the gear's face is a little less wide


they still fit in perfectly, but this is the wrong motor gear! I had to order the right one before it would work!

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1984 300sd auto with 246,000 miles

Great info. Thanks for sharing.

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K

I ordered some gears from the links you provided.
They came straight out of China.
Just put them in, works great.

Thanks for the research Mike.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.

NICE !!! thanks for posting this information, this is something that i'v been wanting to do for some time "for good measure" before things do break.......this info is priceless !!! 51 cents !! amazing !!

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-Justin

I believe in extreme automotive perfection whenever possible.......there is no such thing as "It doesn't matter" !!!

1985 300 CDT - 287k miles

1980 240 D - 340k miles

With extras !!

http://facebook.com/BenzDieselTuner

http://facebook.com/SWFLAlternativeFuelsClub

http://facebook.com/SWFLBenzClub

http://SWFLBenzClub.com

Thanks a lot. I've been waiting for information like this, so I rushed to the site to order the gears and wouldn't you know it, they are our of stock Part No.: GC0.5-12/48-20. I sent them an email inquiring about when would they get some more. Will see what happens. I got a quick response. They updated their quantities so I was able to complete my order.